... dũng in xoay chiu cú giỏ tr l A 120Hz B M C C 100Hz D 50Hz Cõu 32 on mch xoay chiu gm t in cú in dung C = 104 (F) mc ni tip vi in tr thun cú giỏ tr thay i t vo hai du on mch mt hiu in th xoay chiu ... mch in xoay chiu nh hỡnh v (Hỡnh 49) Ngi ta R o c cỏc hiu in th UAM = 16V, UMN = 20V, UNB = 8V Hiu in th gia hai u on mch AB l: A A 44V B 20V C 28V D 16V Cõu 50 Chn cõu ỳng Cho mach in xoay chiu ... B ZL=100 ;R=300 C ZL=200 ;R=200 D ZL=250 ;R=200 Cõu 7: Mt on mch xoay chiu R,L,C ( cun cm thun ) , R thay i t vo u on mch inỏp xoay chiu cú giỏ tr hiu R R1 ( cỏc i lng khỏc gi nguyờn) cong...